Roule&reg; RL-9805h Wireless Personal Safety Alarm System Home Security Window Sensors House Alarms Door Alarms Super easy to install, no wiring and tool required, mounting hardware included. 120 dB alarm sound loud enough to scare the home intruder away, keeps your family and house safe 24/7. It comes with three easy-switching mode: OFF/CRIME/ALARM. Low battery test button to check battery life.